Plug



FIG. 1 is a perspective view of the plug;

FIG. 2 is a top plan view of the plug;

FIG. 3 is a rear plan view of the plug;

FIG. 4 is a side plan view of the plug;

FIG. 5 is a rear plan view of the plug; and,

FIG. 6 is a bottom view of the plug. 

I claim the ornamental design for a plug, as shown. 